Protector for hand-hole covers.



P. WEBB. PROTECTOR FOR HAND HOLE COVERS.

APPLIOATION FILED MAY 23, 1914.

Patented Mar. 9, 1915.

THE NORRIS PETERS 60., PHOm-LITHo.. WASHINGION D. C

em 1 TEZDL arana FRANK WEBB; or MELROSE. uAssaeHns-srrs memo-a Foe H ND-nets Cor ss- T all whom. it may concern:

Be: it known thatI, FRANK'WEBB, a citizen of the United States, and resident of Melrose, in the county of Middlesex and State of Massachusetts, have; invented certain new and useful ImprovementsinPrm tectorsfor Hand-Hole Covers, of; which the following is a specification.

This invention relatesztoa steam boiler having a hand. hole, and a cover therefor seated on the inner surface of the head in,

and are often so affected therebythat the nut becomes inseparably united to theb'olt and the bolt is liable to be twisted and broken when the nut is turned to unscrew it from the bolt. 7

My invention has for its object to provide simple and effective means for so protecting:

the said bolt and nut that they are not liable to be rendered inseparable by heat.

The invention consists in the improved protector which I will now proceed to describe and claim.

Of the accompanying drawings forming a part of this specification: Figure 1 represents an elevation of a portion of the outer side of a boiler head, showing a hand hole cover secured by the usual bolt, nut, and yoke, and a bolt and nut protector embodying my invention, a part of the protector being broken away; Fig. 2 represents a section on line 22 of Fig. 1; Fig. 3 represents an end view of the protector without the heat insulating material hereinafter referred to; Fig. 4 represents a view similar to Fig. 2, showing a modification; Fig. 5 represents a view similar to Fig. 1, showing anothermodification; Fig. 6 represents a section on line 66 of Fig. 5.

Specification of tettersltsnt.

Pa ented Mar-9; 191 a, Application filed May 23, 1914; Serial no. 840,650a

Thesame reference-characters indicate the, same; or similar parts in all the views.v

In the; drawings, 12 represents aboilerr hea'dhav-ingia hand hole 13.

141 represents the usual handhole cover seated on the inner side of the head'and having a bolt 15: which projects through: the

hand hole and is. threaded at its outerend portion to engage the nut 16. v

17 represents the ho-band 18 the arms of the usualzyoke, which cooperate with thebolt and nut in securing the cover 14; in

place. Thebolt passes loosely through the hub.- 17, and the nut 16 when set up against the outer end of the. hub. holds the cover Ml against. the inner side andthe yoke arms 18 against the outer sideof the head. The,

hub'li, arms 18 and nut 16 constitute the usual, fastening means, not claimed hyine, cooperating with the cover 1 1%, bolt 15,-

the boiler head, securing the cover in place, the cover being removable from the head asvusual when the nut and the: yoke formed by the hub and arms are removed from the bolt,

I 19 represents a cup, preferably of cast iron, formed to bear on the outer side of. the head 12 around the hand hole 13, and to receive the bolt, the nut, and the yoke. Said cup is provided internally with a memberadapted to engage the yoke and to detacha'bly confine the mouth of the cup against the head 12. Said member is preferably a shouldered lug 20 cast on the inner surface of the cup and having a face 21 formed to bear on the upper side of the hub 17, and a face 22 formed to hear at the same time on the inner end of said hub, said faces being so arranged that when they simultaneously engage the upper side and inner end of the hub, the mouth of the cup is held closely against the head 12. The length of the face 22 and the distance between the upper and lower portions of the internal surface of the cup at the mouth thereof are such that the cup can be raised from the position The cup is prepared for use by inserting in it a plastic mass of heat-insulating material 23 composed of loose asbestos mixed Q I y 1,130,779

V of the nut.

suflicient to coat .the exposed surfaces of the nut and of the outer portion of thebolt' and parts 'of the exposed surfaces of-the hub 17. The plastic mixture 'hardens by drying sow thatitretainsthe form originally imparted. to 'it' by'the confining surfaces, 7

and may therefore be removed and again applied with the cup. I have found that they heat-insulating .material thus applied protects the threaded portion of the bolt and the nut so that they are not liable to be rendered inseparable by heat.

The means for securing the cup 19 to the I pro ecting cover fastener formed byJ-the bolt and yoke may be variously modified,

two'modifications being shown by Figs. 4,

5 and 6. Fig. ishows a rod inserted at its outer end in a hole formed for its re- 7 ception in the cup and secured by suitable .means such as a nut 27. The inner portion of the rod isarranged to bear on the periphery of the hub 17 and has an ear 28 arranged tobear on the inner end of the hub.

, Figs. 5 and 6 show, as an alternative form *ofcup-securing device, a rod 29 which may be a large sized wire nail or spike inserted in holes formed for its reception in opposite portions of the cup wall and arranged to bear on the bolt 15 and on theinner end ofthe hub, as shown by Fig. 6. p 7

Having described my rinvention, I claim: l. A hand hole cover protector composed of a cup formed to bear on a boiler head around a hand hole therein, and a securing member engaged with the cup and adapted to detachably engage a hand hole cover fastener projecting from said head, the cup being. adapted to confine a body of heat-insulating material.

2. The combination with a boiler head and a hand hole' cover having a bolt, nut, and yoke'projecting through the hand'hole in said head, of a cup formed to bear on the head around the hand hole, and asecuring member. engaged with the cup and adapted,

to-detachably5:engage said yoke and hold the I mouth of the cup against the head. 7

8. The combination with a boiler head and a hand hole coverhaving a bolt, nut,

and'yoke projecting through the hand hole in said head, of a cup formed to bear on the head around the hand hole, and an internal shouldered lug engaged with the cupand,

formed to engage the periphery and inner end of the yoke hub.

In testimony whereofI have aflixed my 1 signature, in presence of two witnesses.

* K FRANK WEBBQ Witnesses:

,. S. PEARL BROOK,

- MARY DE CLEoA. j.

9 vI! thil Plfflltfll, h damn- 11- five cents each, by addressing the Gominini f 012 1 wnhington, D. 6. 

